JP2018178667A - Construction method of rebar for piles, piles and underground heat exchange piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforced cage for a pile, a pile and a construction method of a piping for underground heat exchange which suppresses decrease in heat exchange efficiency due to deformation of a piping for heat exchange or contacting of pipings with each other and which also efficiently and properly performs heat exchange near the ground, by using a piping for underground heat exchange disposed in a foundation pile of a building, without cross-sectional loss and filling defect of concrete.SOLUTION: A reinforced cage 20 comprises: a cage structure including a plurality of pile main reinforcements 21 disposed surrounding pile cores, and a hoop reinforcement 22 holding the plurality of pile main reinforcements 21 inside a plane; an extended member 42 one end of which is fixed to the reinforced cage 20 and the other end of which is extended to the outside of the cage structure; and a flat bar 44 that is connected with the other end and is extended around the cage structure with being separated at a predetermined interval. The reinforced cage 20 is inserted into a drilled hole 10, and a piping support portion 40 is connected with the flat bar 44.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of installing a rebar for a pile, a pile, and a ground heat exchange pipe to which a ground heat exchange pipe for performing ground heat exchange using a foundation pile of a building is attached.

  A stable underground temperature may be used as a heat source for air conditioning throughout the year compared to the outside air temperature. For example, there is a borehole method in which a hole is opened in the ground, a heat exchange pipe is inserted, and the hole is filled. However, this method is expensive for drilling. Therefore, there is also a method of performing heat exchange by installing a heat exchange pipe for flowing a heat medium such as water inside a foundation pile of a building.

  FIG. 8 is an explanatory view of a rebar girder 20 for building in a drill hole 10 and constructing a cast-in-place foundation pile. In the reinforcing bar wedge 20, a large number of hoops 22 are arranged around a plurality of pile main bars 21 arranged in the depth direction. Furthermore, on the outer periphery on the upper side of the reinforcing bar wedge 20, a trapezoidal plate spacer 25 having a narrow outer side is provided. The spacer 25 is disposed in the air gap 11 between the well 10 and the rebar 20 in order to prevent the biased installation (eccentricity) of the rebar 20 in the well 10.

  The heat exchange piping 30 is disposed in the air gap 11 on the outer peripheral side of the rebar 20 (pile main reinforcement 21, hoop reinforcement 22). The heat exchange pipe 30 has a U-shape including a pair of pipes whose lower portions are connected. Then, concrete is poured into the borehole 10 to construct a foundation pile. Since the heat exchange piping 30 protrudes on the outer peripheral side of the reinforcing bar wedge 20, it can be disposed at a position closer to the inner wall surface of the drilling hole 10, and heat exchange can be performed efficiently.

  A technique of providing the heat exchange piping 30 on the outer peripheral side of the reinforcing bar wedge 20 by the spacer 25 of the reinforcing bar wedge 20 is also studied (see, for example, Patent Document 1).

JP 2004-332330 A

  However, the heat exchange pipe 30 is flexible to some extent. For this reason, as described in Patent Document 1 above, when the heat exchange piping 30 is bound to the spacer 25 with a number wire or the like and supported, the heat exchange piping 30 is smoothed in a region not fixed by the spacer 25. Difficult to place on. In addition, when the heat exchange pipe 30 collides with the hole wall of the drilling hole 10, the heat medium in the heat exchange pipe 30 may cause leakage.

  Further, in the U-shaped heat exchange pipe 30, the water temperature flowing in the forward path and the return path is different. Therefore, when two pipes come in contact with each other, adequate heat exchange in the ground can not be realized.

  -A reinforcing bar for piles for solving the above problems includes a barb structure including a plurality of pile main bars arranged around a pile core and a holding member for holding the plurality of pile main bars in a plane, Is fixed to the weir structure, and the other end is connected to the extension member extended to the outside of the weir structure, and the other end, and is disposed along the weir structure at a predetermined distance from the weir structure And an installed member. As a result, efficient heat exchange can be realized outside the weir structure, and the underground heat exchange piping can be held along the side members.

-In the above-mentioned pile rebar girder, it is preferable to have provided underground heat exchange piping fastened to the said juxtaposed member. Thereby, deformation of the underground heat exchange piping can be suppressed.
-In the above-mentioned pile reinforcing rod, it is preferable that the extension member is fixed to the reinforcing ring of the rod structure. Thereby, underground heat exchange piping can be fixed firmly.

  -In the above-mentioned pile reinforcing rod, the leg portion is connected to the rod structure, the head is interposed between the other end of the extending member and the running member, and the supporting member is supported It is preferable to provide a supporting member. Thereby, the installation member can be fixed firmly.

  The present invention uses heat exchange piping installed in a foundation pile of a building without causing cross section loss or filling failure of concrete, and heat exchange due to damage due to deformation of underground heat exchange piping or contact between pipes The heat exchange can be performed efficiently and accurately near the soil while suppressing the decrease in efficiency.

It is explanatory drawing of the reinforcing rod for piles in this embodiment, Comprising: (a) is plane sectional drawing of the whole reinforcing rod ridge for piles, (b) is plane sectional view of the principal part of reinforcing rod ridge for piles. The perspective view of the piping support part in this embodiment. It is explanatory drawing of attachment of the heat exchange piping in this embodiment, Comprising: (a) is a side view, (b) is a perspective view. It is explanatory drawing of the construction procedure of the underground heat exchange piping of this embodiment, Comprising: (a) is erection of a reinforcing rod and (b) is explanatory drawing of attachment of heat exchange piping. It is explanatory drawing of the piping support part in a modification, Comprising: (a) is T bar, (b) is explanatory drawing at the time of using L angle. Explanatory drawing of the piping support part in a modification. It is explanatory drawing of the piping support part in the example of a change, Comprising: (a) is explanatory drawing before attachment of underground heat exchange piping, (b) is after attachment of underground heat exchange piping. Front sectional drawing of the reinforcing rod for piles in a prior art example.

  Hereinafter, one embodiment of the construction method of the reinforcing rod for piles, piles, and underground heat exchange piping will be described using FIGS. 1 to 4. In this embodiment, it is assumed that a cylindrical cast-in-place pile surrounding a pile core is used.

  Fig.1 (a) is a plane sectional view of the state which erected the rebar 20 in the wellbore 10, FIG.1 (b) is a plane sectional view of the principal part of Fig.1 (a). In addition, methods such as an earth drill method, a reverse circulation method, and an all-casing method can be used as a method for constructing a cast-in-place foundation pile.

  As shown in FIG. 1 (a), the reinforcing bar cage 20 has a barb structure in which a large number of hoops 22 (retaining members) are arranged around a plurality of pile main bars 21. A spacer 25 for preventing eccentricity of the reinforcing bar wedge 20 is provided on the outer periphery of the reinforcing bar wedge 20. In this embodiment, the spacers 25 are in the shape of a chevron and are installed at equal intervals on the outer periphery of the rebar 20. Furthermore, a reinforcing ring 23 (a holding member) formed of a flat plate ring (flat bar) made of steel is welded at a predetermined interval in the depth direction on the inside of the main pile 21 of the reinforcing bar 20. Note that, for the reinforcing ring 23, an H-shaped steel, an equilateral angle steel, or the like may be used. Although the distance between the reinforcing rings 23 is wider than the distance between the hoops 22, the reinforcing rings 23 have higher strength than the hoops 22, suppress the deformation of the reinforcing bar 篭 20 and maintain the shape of the reinforcing bar 篭 20.

  A plurality of heat exchange pipes 30 are provided on the outer periphery of the rebar 20. The heat exchange piping 30 is U-shaped which consists of a pair of pipe which the lower part continued. The heat exchange pipe 30 is attached to and supported by the reinforcing bar wedge 20 by a pipe support portion 40 described later. In the present embodiment, the pipe support portion 40 is provided in the vicinity of the spacer 25.

(Configuration of piping support 40)
The piping support part 40 which supports the heat exchange piping 30 is demonstrated using FIG. In addition, in FIG. 2, the pile main reinforcement 21 of the rebar 20, the hoop reinforcement 22, and the heat exchange piping 30 are abbreviate | omitted.

The reinforcing ring 23 includes an extending member 42 projecting to the outside of the reinforcing bar wedge 20. In the present embodiment, a reinforcing bar is used for the extension member 42.
The auxiliary rebar 45 is fixed to the pile main reinforcement 21 at the same position and shape as the hoop reinforcement 22 at the upper and lower positions of the depth with respect to the reinforcement ring 23. In addition, it is also possible to use the hoop reinforcement 22 itself as the auxiliary reinforcing bar 45.

  A flat bar support member 43 is provided, which is supported by the extension member 42 on the rear surface (rebar rod 20 side) of the top. The flat bar support member 43 is formed of a trapezoidal steel flat plate, and the bottom (legs) of the flat bar support member 43 is fixed to the auxiliary reinforcing bar 45 by welding.

A flat bar 44 made of steel is fixed to the outer surface of the top (head) of the flat bar support member 43 by welding. The flat bar 44 is provided along the area where the heat exchange pipe 30 is disposed in the drilling hole 10.
In this case, the projection length of the pipe support 40 is designed so that the outer end of the flat bar 44 is closer to the reinforcing bar wedge 20 than the outer end of the spacer 25.

(Construction method of heat exchange piping 30)
Next, the construction method of the heat exchange piping 30 to the piping support part 40 is demonstrated using FIG. Fig.3 (a) is a side view of the midway area | region of the heat exchange piping 30, and the lowest end, and FIG.3 (b) is the perspective view. Also in FIG. 3 (b), the pile main bars 21 and the hoop bars 22 of the reinforcing bar wedge 20 are omitted. As shown in FIG. 3 (b), a pair of heat exchange pipes 30 are disposed to sandwich the flat bar 44. The lowermost end of the flat bar 44 is up to the upper front side of the U-shaped portion of the heat exchange pipe 30.

(Installation procedure of heat exchange piping 30)
Next, the attachment procedure of the heat exchange piping 30 to the rebar 20 provided with the piping support part 40 mentioned above using FIG. 4 is demonstrated.

  As shown in FIG. 4 (a), the rebar 20 is suspended by a crane 50 and inserted into the drilled hole 10. In this case, a tube reel 51 around which a pair of unused heat exchange pipes 30 is wound is disposed around the drilling hole 10.

  FIG. 4 (b) is a top view showing the arrangement of the wellbore 10 and the tube reel 51. When fixing a plurality of heat exchange pipes 30 to the rebar 20, tube reels 51 corresponding to the fixed number are prepared. Then, a U-shaped portion is attached to the lower end portion of the pair of heat exchange pipes 30 and fixed to the reinforcing bar wedge 20 below the flat bar 44. Then, the pipes of the pair of heat exchange pipes 30 are disposed on both sides of the flat bar 44.

Specifically, the worker 55 attaches the pair of heat exchange pipes 30 wound around the tube reel 51 to the pipe support portion 40 of the rebar 20 while pulling out the pair of heat exchange pipes 30.
In this case, the heat exchange piping 30 is fixed to the flat bar 44 using a wire (for example, a wire, a binding band, or the like) at a predetermined interval while lowering the rebar 20 having a predetermined length by the crane 50.

  Furthermore, new rebars 20 are sequentially connected to the rebar 20 built in the drill hole 10 as needed. Also in this case, the pair of heat exchange pipes 30 is attached to the pipe support portion 40 of the reinforcing bar wedge 20 while being pulled out from the tube reel 51.

  When the rebar 篭 20 reaches the pile top level, stop the rebar 降下 20 from falling. Then, the heat exchange pipe 30 is separated from the tube reel 51, and concrete is poured into the excavated hole 10 in which the reinforcing bar wedge 20 supporting the heat exchange pipe 30 is built to construct the main body of the foundation pile.

According to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, since the heat exchange piping 30 is installed on the outer periphery of the reinforcing bar wedge 20, heat exchange can be performed efficiently. Concrete is filled between the heat exchange pipe 30 and the soil (the hole wall of the drilling hole 10), but the concrete thickness is smaller than in the case where the heat exchange pipe 30 is installed inside the pile, and it is closer to the soil, so the efficiency Heat exchange can be performed. Furthermore, as in the case of providing the inside of the pile main body, there is no occurrence of cross section loss or filling failure of concrete.

  (2) In the piping support portion 40 of the present embodiment, the flat bar 44 is provided along the region where the heat exchange piping 30 is disposed in the drilling hole 10. Then, the heat exchange piping 30 is fixed to the flat bar 44 using a number line at predetermined intervals. Thereby, even if the heat exchange piping 30 is deformed in the drill hole 10, damage due to contact or deformation of the drill hole 10 with the hole wall can be suppressed. Furthermore, the pipes of the pair of heat exchange pipes 30 are disposed on both sides of the flat bar 44. Thus, the arrangement of the forward and return paths of the heat exchange pipe 30 can be separated by the flat bar 44, and a decrease in heat exchange efficiency due to the contact between the forward and return path pipes can be suppressed.

  (3) In the piping support portion 40 of the present embodiment, the extension member 42 is fixed to the reinforcing ring 23. The top of the flat bar support member 43 is fixed to the extension member 42. Then, the flat bar 44 is fixed to the flat bar support member 43. The heat exchange pipe 30 can be moved to the hole wall side of the drilling hole 10 by using the reinforcing ring 23 which is a steel member of the reinforcing bar wedge 20. Further, the deformation of the flat bar support member 43 can be suppressed by the extending member 42. Furthermore, the flat bar 44 can be firmly fixed on the surface by the flat bar support member 43.

The above embodiment may be modified as follows.
In the above embodiment, the heat exchange piping 30 is supported by the piping support portion 40 attached to the reinforcing ring 23. The pipe support portion 40 includes the extending member 42, the flat bar support member 43, the flat bar 44, and the auxiliary reinforcing bar 45. The structure of the piping support part 40 is not limited to these. For example, a side member of a shape that covers the heat exchange pipe 30 may be used.

  As shown to Fig.5 (a), it may replace with the flat bar 44 of the said embodiment, and may use T-bar 61 of a T-shaped cross section. In this case, the heat exchange piping 30 is disposed at both corners of the T-bar 61. Thereby, the contact of the heat exchange pipe 30 with the hole wall of the drilled hole 10 can be more reliably suppressed.

  Moreover, as shown in FIG.5 (b), it is also possible to replace with the flat bar 44 of the said embodiment, and to use the installation member of an umbrella-shaped cross section. In this case, the inner portion of the L-shaped L angle 62 is fixed to the upper end of the flat bar 44. In this case, the heat exchange pipe 30 is fixed to the heat exchange pipe 30 between the flat bar 44 and the L angle 62, so that heat exchange (modification) of the heat exchange pipe 30 can be suppressed.

In the above embodiment, the flat bar 44 is fixed to the flat bar support member 43. The fixing method of the flat bar 44 is not limited to this.
As shown in FIG. 6, the flat bar 44 may be directly fixed to the extension member 42.
Further, the fixing destination of the extension member 42 is not limited to the reinforcing ring 23, and may be fixed to a member (pile main reinforcement 21 or hoop reinforcement 22) constituting the reinforcing bar wedge 20.

  In the above embodiment, the heat exchange pipe 30 is fixed to the flat bar 44 as a side member. The installation members are not limited to the flat bar 44 as long as they support the heat exchange piping 30 in a predetermined area in the depth direction of the reinforcing bar wedge 20.

  As shown to Fig.7 (a), you may use the supporting member 65 (extension member) which supports the installation material 66 as an installation member. In this case, the support member 65 is fixed to the pile main reinforcement 21 and the hoop reinforcement 22 of the rebar 20. And as shown in FIG.7 (b), the heat exchange piping 30 is fixed to the both sides of the runway material 66 using the number wire 67. FIG.

  -In the said embodiment, the flat bar 44 made from steel is used as a side member. Here, the material of the flat bar 44 is not limited to steel. The flat bar 44 is preferably one having poor thermal conductivity (e.g. reinforced plastic etc.). Thus, the forward path and the return path of the heat exchange pipe 30 can be thermally separated.

  DESCRIPTION OF SYMBOLS 10 ... Drill hole, 11 ... Air gap, 20 ... Reinforcement bar, 21 ... Pile main bars, 22 ... Hoop line, 23 ... Reinforcement ring, 25 ... Spacer, 30 ... Heat exchange piping, 40 ... Piping support part, 45 ... Auxiliary rebar, 42 ... extension member, 43 ... flat bar support member, 44 ... flat bar, 50 ... crane, 51 ... tube reel, 55 ... worker, 61 ... T bar, 62 ... L angle, 65 ... support member, 66 ... along Construction material, line 67.

Claims (6)

Several pile main bars arranged around a pile core,
A weir structure including a holding member for holding the plurality of pile main bars in a plane;
An extending member having one end fixed to the weir structure and the other end extending to the outside of the weir structure;
A rebar for piling comprising a longitudinal member connected to the other end and provided along and spaced apart from the weir structure by a predetermined distance.   The underground heat exchange piping fastened to the said juxtaposed member is further provided, The rebar gutter for piles of Claim 1 characterized by the above-mentioned.   The said extension member was fixed to the reinforcement ring of the said gutter structure, The rebar gutter for piles of Claim 1 or 2 characterized by the above-mentioned. The legs are connected to the weir structure,
A head is interposed between the other end of the extension member and the standing member,
The support rod which supports the said juxtaposition member is provided, The rebar gutter for pilings in any one of Claims 1-3 characterized by the above-mentioned.   A weir structure including a plurality of pile main bars arranged around a pile core and a holding member for holding the plural pile main bars in a plane, one end is fixed to the weir structure and the other end is the weir A pile rebar including a extension member extended to the outside of the structure and a continuous member connected to the other end and spaced apart from the weir structure by a predetermined distance. A pile built in a hole and having concrete provided in the pile hole. Several pile main bars arranged around a pile core,
A weir structure including a holding member for holding the plurality of pile main bars in a plane;
An extending member having one end fixed to the weir structure and the other end extending to the outside of the weir structure;
A piling rebar including a side member connected to the other end and installed along a side of the gutter structure at a predetermined distance from the gutter structure is built in a pile hole,
The underground heat exchange piping is fastened to the said juxtaposed member, The construction method of the ground heat exchange piping characterized by the above-mentioned.

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